Chicken Chile Casserole

1 small chopped onion
1 small can chopped green chiles
1/2 cup evaporated milk
1 can cream of mushroom soup
1 (8 ounce) box Velveeta cheese, cubed
2 cups cooked, shredded chicken
Grated Cheddar cheese
Tortilla chips

Mix the first five ingredients and heat until cheese melts. Add the chicken. Stir and set aside.

Line a 9 x 11-inch casserole dish with tortilla chips. Pour the chicken mixture over.

Bake at 325 degrees F for about 20 to 30 minutes.